Headphone stand



FIG. 1 is a front, top, right perspective view of a headphone stand showing the new design;

FIG. 2 is a right side elevational view thereof, the left side elevation view being a mirror image;

FIG. 3 is top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 if a front elevational view thereof; and,

FIG. 6 is a back elevational view thereof. 

CLAIM The ornamental design for a headphone stand, as shown and described. 